Scenario-Based Activities

Scenario-Based Activity

Students first investigate the concentration of reactants and products and forward and reverse reaction rates at equilibrium. Students go on to learn about LeChatelier's Principle and how changes in concentration…

Tutorial

Tutorial

Chemists use LeChatelier's principle to reason qualitatively about the influence of changes in concentration, temperature or pressure on systems that are at equilibrium. This movie describes the hemoglobin scenario…

Tutorial

Introduces the general formulation of Le Chatlier's principle. LeChatlier's principle is a general and very powerful framework for making predictions about the effects of stress is on chemical systems.

Tutorial

LeChatelier's principle is a qualitative approach to reason about how systems at equilibrium will react to changes. This tutorial looks at how changes in volume or pressure influence systems at equilibrium.

Concept Test

Tutorials

Tutorial

If a system has not reached chemical equilibrium, we can use the reaction quotient, Q, and the equilibrium constant, K to determine whether the reaction will shift towards products (right) or reactants (left).

Tutorial

Once a system has reached chemical equilibrium, reactions still occur. Equilibrium systems are dynamic. Although the concentrations have reached a steady state, both the forward and reverse reactions continue to…

Tutorial

Chemical equilibrium systems obey the law of mass action. This law states that the reaction quotient, Q, will be equal to a constant when a system reaches chemical equilibrium. This tutorial explains the law of…

Concept Test

Scenario-Based Activities

Scenario-Based Activity

This activity explores the equilibrium of dyes that self-assemble into DNA templates. Students use knowledge of equilibrium and quantitative spectroscopy to explore different dyes that bind selectively to DNA molecules.…

Simulations

Simulation

This applet is similar to the stoichiometry simulation but applies to chemical reactions that do not go to completion. The calculation of the equilibrium state of such reactions is typically covered months after…

Simulation

To get to the top of the mountain before winter arrives, students must derive an equation that relates the necessary amount of hemoglobin to the partial pressure of oxygen at the current and next camp.

Tutorials

Tutorial

Tutorial

How do we determine final concentrations for equilibrium systems? When reactions are reversible, neither the forward nor the backward reaction will progress to completion. This page demonstrates quantitative calculations…

Tutorial

Many reversible reactions have large or small values for their equilibrium constant, K. That is, one reaction (either the forward or the reverse) is much stronger than the other reaction. For instance, most…

Tutorial

Tutorial

Quantitative calculations on chemical equilibrium systems often lead to rather tedious algebra involving cubic or high-order polynomial equations. Since all possible states of a chemical reaction (e.g., values…